DemelzaRobins:
Etym: The name comes from a placename, and was popularized by a character
in the Poldark
series.

dementor:
A corpselike, possibly undead creature that feeds on emotions, draining
away a person's will to live. Usually swathed in a cloak, their faces
are seen only by people about to receive a dementor's kiss. Dementors
are the guards of Azkaban.

Etym: Derived from Dionysius, though the exact etymology is
uncertain. St. Denis is a patron saint of France, who according to legend
was martyred by decapitation. He is portrayed in art as a headless living
figure.

Although captive dragon breeding is now outlawed, dragons are still useful to
wizards in many ways. Their heartstrings are used in wands, their dung is
used as compost for magical plants, and Albus Dumbledore alone has
invented twelve uses for their blood.

When facing a dragon, it is helpful to remember that its eyes are its
weakest spot.